Question

So I’ve read that ActualWidth may equal 0 until it is fully loaded. I added its event handler, like so, to make sure it’s fully loaded:

text.AddHandler(TextBlock.LoadedEvent, new RoutedEventHandler(textBlock_Loaded));

In the textBlock_Loaded event, I have:

TextBlock tb = sender as TextBlock;
textBlockWidth = tb.ActualWidth;

I need to use the variable textBlockWidth in my main method, but everytime I write the value of textBlockWidth to output in my Main method, I get 0.

So this question is, how do I ensure that ActualWidth is NOT 0 before performing my actions? Since WPF is event-driven, is there a way I can trigger some method when it’s done, instead of before? Otherwise, it’ll return 0.

Answer 1

You won’t be able to get the ActualWidth. Since, it will not be updated at the time of loaded. So, you should use Dispatcher of the TextBlock or it’s Parent to get the ActualWidth or ActualHeight.

this.textBlock.Dispatcher.BeginInvoke((Action)(() =>
            {
                textBlock = this.textBlock.ActualWidth;
            }));